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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfc9ecc540ce32970360f0b73599d58e854cd852a50cf00f45338e84ca2ad62' 
  AND token = 'nBWQzMquLWLHIuCicTjCzHP1fF0wR16xyGt/C5+a638=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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