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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f30ae09e5094949b39d7b1b48071f6492f97591cce5e82762894c24225df2fc' 
  AND token = 'CIm+6E4dkAR4nnWlRfATkx7vsXXMHhN8DiM4poZXqjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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