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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7916263042e77c4c3d85437b92020d8123c3f50137f2d70b6d5cae1d2341485b' 
  AND token = 'ZzI84hs6AADG2EQPadRmu42OTwdbDZYFedGJSwe1cms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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