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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d4683d786581854d83e4e33636bbfd9252286716aa4417420f16fa985f385b' 
  AND token = 't1x6r0FjaupR4otpEKy4X5X/OF9vK+8TPeV8cuQGeTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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