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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8d73473988518ca399ab2d407a9cc664bb89cf3146373e4eb32bbd1943d35e' 
  AND token = '23fQwQMcbskOPV9drQdA9TDRE4zrNVYtFS9t6xERLI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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