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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f71665fe1f715926630f6a2fd7df2c3667fb3ea5467553266384c71c3ae62a' 
  AND token = 'mM7aiJpzrXX6+tDtVX/Inx2LXvtg+poU616JkveaIFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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