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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecc1c86ad51466c1c8b2527a095b9531cee91eaaa9c711ae95bde6ba8598645' 
  AND token = 'n64scAhn32l53NEQSm09YCXLYPZx2SDhP+Ry9atXw/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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