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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b832ab4cdd6c0a349b44de4a10b93556d12234268135cd8c16b160788e42522' 
  AND token = 'hxuMGlOpxCi8sygyy1R+unlVhdsaQWKGxK4CxxvjR+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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