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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e4e41a345f85ad41df8045ba9832a2cf969528d737b0a98ecc5e4c05c35dc7' 
  AND token = '8UPqk9PRPpQSNLbObie328Ul4dy0n4Kjb6kn+EMvEXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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