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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e000c77cfb90022076d45cc4549b4a7508b2c17191cf613ade2d7cdadf38de' 
  AND token = '43zWeHLFmH6BB+xXr5b7Asbbc2hJGWS9Me9T6Wey4IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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