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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60dfbb14baa2ce9f6e1732c2c359092bb5eee7e1c39bd910f050ce392063c53' 
  AND token = 'qwNFnFxAZNZip6iPERraCt2TWL194vDSYN350pA8f5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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