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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2564c6d5eac10201dd257eee43a29515fe0ec93673b9330cd0514a95cc4f05' 
  AND token = 'q2ulYQAGQ/PPhCCSpg9L8H2B07QiWZz2fGtz6OeGBdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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