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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d0d27894c5f7ba4db3a0712a697b0343d1489fe204b35b807f0b95e1bbdccc' 
  AND token = 'JbjihwK5lSdk411odI9PpVCQbZ9uxpdNXFu4g6UUXu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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