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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8899e77c53f20ba8d7d353879e53aa197d570997eb63b842c8b4f4236cc8af10' 
  AND token = 'aeGRysDNgrg+5A0bfXNKe89EQWpaAsP09qbasK3vLPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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