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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b76d5170bedae06297ef3f0ff80357562a2508478e25062f7b4fea2153ad0cf' 
  AND token = 'lL5Gog6Ti41OUxmv1NVFPGCYvVDI9CXz9thO1NA8WAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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