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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9440718ef88d985885677d858b4cda9673644aee4ccd60d276dd9836b1b29040' 
  AND token = '9pVTBfR7S1WZoga6iozhfBCe4vEqd9WgyouaO6OSc0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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