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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fd8d3dbf8175eb7d0d5268bd820c0e1aa85f4712c75842e12b7c4cbcabbc8d' 
  AND token = 'Gd4k+fx13/HtFyO1JZ521DlfZzmthABNsznhww7pSCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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