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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc992d2fdc2d5fdb8785f5b33af1f9e74fda7445a48c1f0d7a25bfa43dba7c0d' 
  AND token = 'iDxXqRNDWXBqtm5eTl54R3FGd6AipCST3AtJHVhzNCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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