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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee93ddaaaacce61beed2263c4c11f51eee0f8c0acc8dacf43168e309d1471c2c' 
  AND token = 'DAeJX84obClRKjHKYO58vJug45s8dz/JDZE2iYAd1yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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