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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9e8701f176c04d473465b797dc95c1f5528bae0964ea6b5526124f7fb502c5' 
  AND token = '+AmtdzZ+zsHUF6JDZWOcfPFJ+xeDxH/7Ec+8j1pwdsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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