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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb7a62a7162a75ca7fc3a7af381292c56458f6ff642bf76d345148338b626b8' 
  AND token = 'KNIeBpgernPpA08Z/W7mD3i4um6S+rpOzxUup/B1jKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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