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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952971aab2c2101858d6b93be4d9cb81168086db999829d4e223af3be3beca7e' 
  AND token = '3Pk4LuT7Kb0msXbrK6+yoHgZOPS/0+INSNeCPdmZX4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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