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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab372ea3627b10c12737abd9fcc96fc3e45c08901cbe9b0bc5fd520e24c462b' 
  AND token = 'cQmyUxBNi0V0UeQI6180wLzxzIjyyBGXAq4BoN3IJ20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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