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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db496048a0dc1c532cc2de26fc00968098d4b794cd44b086aed0fd5f02fad632' 
  AND token = 'LqUS8g+Eh45xd5xOWKU3cISG8C7A+/U+yTJDRRYngg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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