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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9c564eb2da487bd8f9acaa5d61d6613e054716f7e19cd94bf3df6dec6e3d57' 
  AND token = 'bmGyHMHP280JRNIolFJwelV/Dg1tcwHkmzdWsbVDtNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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