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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51669aa6453127fc0e677c1bff4d14516f8c60fa7680afbe6fcf1aba8c43b3f0' 
  AND token = 'OYFHVeI+MUfKPR2kA1Kw47YhfykQTMA1unsO63qtOw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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