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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707870b9081aa96170b9e6b9a04e2e4d78d2b841278eb2abddd7bce5d6e20649' 
  AND token = 'LpshmPOyhyrEsfP5x7qI88mJbFO2d02IGABeg4UEiWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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