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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe79630b40df65c3cb9f85d710bbceaee64be9fac6f90f038a35690d884cf1d' 
  AND token = 'xhBFx+7mYJ328YkJ2/f+i9vdbY9PMTi1lka51fh8Nw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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