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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681decfb4e1beb0f1c3db93f8f3e461684536cb3f870b5123368c6f9ab8a18bf' 
  AND token = 'KqqMR2URYJyHm9ftuV52G4rscgVuija9o/Dt4kE+yhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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