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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a49fc34273f8f64ab4477e1f79ea647d4ff02da04b10ef89e5806e9b044841' 
  AND token = 'Oymp3+iXDYX6RfA6eZOlxO7oFJX3VznlulUU+kYKXV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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