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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c810a8d0ffd81d7007440dc9207dda884b0ea91b6db876835c0ef85fb024ce55' 
  AND token = 'RnqdZTNg7zSMtl+LAYoJtyqSW20kv/M+JOPoCHHU+5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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