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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aefbb1f6b1f8983804b153fe505b95e3aea7921077236535463384c42d54fdc' 
  AND token = 'E7r7vxdjYsUIP6gTavgFQdiY30huDiBWJSixS32Tvhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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