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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880802ce8b92be0e5cc6bad03ec7cf99494fa1399c345d1fc631708af07af255' 
  AND token = 'P7X/RFcSfPrS68rr/om6Dz1cbbKel2iK7iD5VxImWhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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