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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20dd2e0c4c059bba87f8a6502f3553c200608871e667b5707a82c233e22291e' 
  AND token = 'L4kbtQ2HDRrOC2nBp9fQiO5RZzn1LiU1kUt+5Q7M4qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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