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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa688c9f8c90367acb4d501b0611bfcb41bd607b6a617ea1ac0339cdd68f9d2' 
  AND token = 'jNrmGZNK7iujobyKqSkBinc0BnTkc5NhQG0IvgoHTM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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