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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f2952447177febeda0a6953e4dd2f28db3d33d4d9d1e4e6f44ef9b7798bb53' 
  AND token = '4so0034v262P+gpYAlN0lMNvzY7obKMbihqsHt0G7c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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