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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fb2cdf3127e8e9ed5477a069827746e1039de36c9a87f43a9d44a0cdcc33bf' 
  AND token = '5E1iNSl2YAOFKoF9gF3iyFD+mWRivsx/x64YFBfS/6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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