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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7d0ffdda0d5d03d04438eb42387f6942df7aa3e66aea05cf320a5fbc03c463' 
  AND token = 'AUTDf5IgEO+DQgVP9ITiJS8rTJWS/rNePhVXV28EdHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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