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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952e9939324c5be0ad1a69662e5837b223d9b448c630fba76ac0d7ba5b6576ab' 
  AND token = 'HgtemRt/ddJlsII1qcmSOB/Tltzg7awYRRg2padtxgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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