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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32067b6b1487186cde8e1ce526fb4eee9fdc6b968f5eec63f9db048588dbe7f2' 
  AND token = 'e7Y3IIikGETajnyhPDFQulD2zy2bQM+sEXV2iV3EX+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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