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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831ee6a1bf5a79171780952940e107305cc8855b05b5cacd98330ce960da08a6' 
  AND token = 'sXfTsxM8nTm5LCNMgfXQKo3UghSPf1PI/EG+1YbCnho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}