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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1615a1a6730f096a4515c8bc533fcf49bef176514ff8b2c0323af314d210203d' 
  AND token = 'fn9zkHomKnRd25VvWSaKF9RS3mtbziYAJzD0DbohcQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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