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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da4e4d06133fa3298384230104d0c58af42504572e42afdd1ce7e8a69295559' 
  AND token = 'pf9XJVsD6qWvVtd1D3CYlk4D2ykhL03HvCZy06sRLbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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