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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760e0634b95f2895222d4562e0eb9a905eba5699e0c39b23f4f5b6cf57b259a7' 
  AND token = 'xQdDr5ML4h76ISYkCNsNvNKU1QFqUD8tnxKn5oL6mIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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