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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cc01dbbf4c6d19bb5de0910c9c702e9c5f2faf649bea35773c506d981945d2' 
  AND token = 'MA3LH8hDs2X0SIKNjDQurBhOqec36Qee9ucvv4nSrko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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