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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbc3e3a1a020036a5664aae6c2c1e3f4be95dd299c4a651c7ddda8a46d8d4c2' 
  AND token = 'Yd+Gsc2LG2bvyaObm+EFaI6xT/JG6H5J0ecd0Ctu7mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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