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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3075e9e25ee6763a5c72642aa45b44969c62b6463cc0fbc0119be247ecf11a' 
  AND token = '/MWnMyQGoxjryP5G7tEexfhPpi9C/V9x7gktg6zPPHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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