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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b25a1249a2190d60240808241c4b6eb3dd1cedc79e26f30f61f5789a2173b14' 
  AND token = '1AlaCqL3NO7Crgbkbi/1U90C/LHK/GRE6HTaYlySF00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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