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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c43ab04fb4f521d2276f08f5fa27ec3677b666a121d8ff06b4385002c881c6' 
  AND token = '53A/flDSy4L8rwjDYQ2wWX3ACcngVQ0gk9HhmpnRd/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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