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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c94e172fd086fe81dbc035cde234d7e1acec2494e6bd8ae8faa77000adecafd' 
  AND token = 'JxSh6ny+2YJ7o7z/gz5s8JtMryhnd8SaU83CvtQ8YaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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