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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e297ac0cac884d3c0f9071fde1cf19b6b22eb817dfed56605aadb6a5cb814a' 
  AND token = 'PdWw8LYAR0NfHTJIlBK2yzrz6cwVSJETnbe1kbarPB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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