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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3dec9829e71c4960108fa163a3fe60dcd3c4f83fd4b10786c8db3cbc01441b' 
  AND token = 'Y+G935Avo6grx/Hrld3litKh5e6tbSyYuRdknyem3t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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