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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c771641ef7724e11643c6505d5fd41bba9cf3ef97f8d4725e4aed13b5a97ddb4' 
  AND token = '8+ie/qHrAHMsL600NPN8s7J5dG/XNI6vyeLya/wRePc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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