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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5728fe5d6cea5ef016fb9696389741c3c6b29fa6404826d8db4f7529ac051315' 
  AND token = 'fktPMcQiZL039I4XIZOgrLulPyqx7Xeykhzcjo3ciow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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