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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641038e9e1745600670db38e9cd5929603dee15d0cd722f1c1edaddc91296754' 
  AND token = 'J/X37vsdUEnROoi8M1RDbl8r48Pdgq8WsXJ9UQLORAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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