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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fe2d0aeacd4e604ebe1f01a9a3a67d7f91b88ebdc15e3f1a4fe4b92642f558' 
  AND token = 'Nqn2KTEF9e6WeZGoMEZBSTy0701kZQYeIi2oLmjWt9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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