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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86b9d3ad42ddd2da79c9a848fdb311608c77e84f52004a9103ebbfbfbd065a3' 
  AND token = '+aI+UUyvs9SsdrCMVmXnSc94RPMRu36cTzRR1hoeytY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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