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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7955a63f66570fa6a692aa6f1caeb42c270ead1bd826a72af9da86de522e2632' 
  AND token = 'EP3KRMiq8HNY8ITa7aCzPTe98o4xb7LCUL9xRIvx39A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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