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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983395b11fac8ea8a2bd1d3176a1cb8b709b707514a71405cfe6eceacb57c2c0' 
  AND token = 'p6HDXlvO4LkACNWo3XdSHbqmMJr3DJLPlXwuZLVr/iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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