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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e79918c0b4c309510ed1f8e516328a139180fd8b3cd1c379c2e9879d64a78a0' 
  AND token = 'SZUBIRQ0q6TRv67rtiwtgVf4cu6U60rgAUmq2nBNM8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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