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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f634805b21de21cbffcb2bf4859bd5b011da2aff62302899e747e81ce44b95' 
  AND token = '8UqjZev30masdeo0NOlgj+zyYTZT1GBFfu0sRGRtU8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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