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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e3be907fc6c83e20edc4024d25ad81836fe98eab3d5e4851d1e178425fef1a' 
  AND token = '6MgzIR9ZBTeLEZGQvu2pMKLIDn/iHEe6/Ve8PDJEtpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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